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A better rust penetrant than even Kroil is a 50/50 mix of acetone and ATF,shake well, apply and let soak. A study was done to show torque needed to remove rusted nuts:
No oil……………..516 FT/LBS
WD40……………..238 "
PB Blaster……….214 "
Liquid Wrench…127 "
Kroil…………………53 "
It works!